/* ========================================================================
 * Copyright (c) 2005-2024 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Extensions.Logging;
using Mono.Options;

namespace Opc.Ua.Fuzzing
{
    public static class Program
    {
        /// <summary>
        /// Relative folder references for testcases and findings,
        /// for when Fuzz.Tools is started from a Visual Studio project.
        /// </summary>
        public static readonly string RootFolder = "../../../../";
        public static readonly string DefaultTestcasesFolder = RootFolder + "Fuzz/Testcases";
        public static readonly string DefaultFindingsCrashFolder = RootFolder + "findings/crashes/";
        public static readonly string DefaultFindingsHangsFolder = RootFolder + "findings/hangs/";
        public static readonly string DefaultLibFuzzerCrashes = RootFolder + "crash-*";
        public static readonly string DefaultLibFuzzerHangs = RootFolder + "timeout-*";

        public static void Main(string[] args)
        {
            string applicationName = typeof(Program).Assembly.GetName().Name;
            TextWriter output = Console.Out;

            output.WriteLine($"OPC UA {applicationName}");
            string usage = $"Usage: {applicationName}.exe [OPTIONS]";

            bool showHelp = false;
            bool playback = false;
            bool testcases = false;
            bool stacktrace = false;

            var options = new Mono.Options.OptionSet
            {
                usage,
                { "h|help", "show this message and exit", h => showHelp = h != null },
                {
                    "p|playback",
                    "playback crashes found by afl-fuzz and libfuzzer",
                    p => playback = p != null },
                { "t|testcases", "create test cases for fuzzing", t => testcases = t != null },
                { "s|stacktrace", "show stacktrace with playback", s => stacktrace = s != null }
            };

            Logging.Configure(applicationName, string.Empty, true, LogLevel.Trace);

            IList<string> extraArgs = null;
            try
            {
                extraArgs = options.Parse(args);
            }
            catch (OptionException e)
            {
                output.WriteLine(e.Message);
                showHelp = true;
            }

            if (testcases)
            {
                Testcases.Run(DefaultTestcasesFolder);
            }
            else if (playback)
            {
                foreach (string encoderType in Testcases.TestcaseEncoderSuffixes)
                {
                    Console.WriteLine("--- Fuzzer testcases for {0} ---", encoderType[1..]);
                    Playback.Run(
                        DefaultTestcasesFolder + encoderType + Path.DirectorySeparatorChar,
                        stacktrace);
                }
                Console.WriteLine("--- afl-fuzz crash findings ---");
                Playback.Run(DefaultFindingsCrashFolder, stacktrace);
                Console.WriteLine("--- afl-fuzz timeout findings ---");
                Playback.Run(DefaultFindingsHangsFolder, stacktrace);
                Console.WriteLine("--- libfuzzer crashes ---");
                Playback.Run(DefaultLibFuzzerCrashes, stacktrace);
                Console.WriteLine("--- libfuzzer timeouts ---");
                Playback.Run(DefaultLibFuzzerHangs, stacktrace);
            }
            else
            {
                showHelp = true;
            }

            if (showHelp)
            {
                options.WriteOptionDescriptions(output);
            }
        }
    }
}
